Officials are probing how a 51-year-old highway bridge came to collapse in the Italian port city of Genoa yesterday, killing at least 26 people and injuring 16 others as it sent dozens of vehicles tumbling into a heap of concrete and twisted steel.

Britain plans $618 million refit for Buckingham Palace

Buckingham Palace is set to get a £369 (A$618) million overhaul to replace leaky pipes and fire-risk cables under a taxpayer-funded plan unveiled on Friday that would see Queen Elizabeth II forced to move rooms.

The works are to start next year and last until 2027 and will see solar panels installed on the roof of the palace as well as more space for public visits in its biggest refurbishment since World War II.

The government is asking parliament to approve the £369 million funding by increasing the share the royals receive from the Crown Estate, which manages royal properties, to 25 percent from 15 percent over the period.

The queen and her husband Prince Philip would remain in residence but would have to temporarily change rooms, while some of the 37 permanent staff who currently live in the palace would have to move out.

"This palace is very much part of our DNA," Tony Johnstone-Burt, Master of the Queen's Household, told reporters at a briefing in a palace drawing room.

He warned of "significant risk of electric shocks and fire" from 60-year-old cables, as well as "potential leakage from lead pipes" that could damage paintings, adding that the palace boilers dated back 30 years.

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The last major overhaul of the palace was carried out shortly after the war to repair damage from German bombing and the new plan is aimed at extending the life of the building by another 50 years.

The project is planned to start in April and royal officials said they expected MPs would approve it by the end of March at the latest, following a recommendation from the government for it to go ahead.

"It is only right we ensure Buckingham Palace is fit for purpose," said David Gauke, chief secretary to the Treasury, calling the proposed work "urgent".

To give an idea of the scale of the project, royal officials said the palace had 775 rooms, 760 windows and 30,000 square metres of floorboards that would have to be taken up -- equivalent to three and a half football pitches.

The palace traces its origins back to the 17th century and has been vastly expanded since then.

It now receives around half a million paying visitors during public visits held in the summer.

The queen spends around a third of the year in the palace, hosting garden parties and ceremonies.

The queen is "fully aware" of the project and "completely supportive", a royal official said.

Much of the building work would be out of the public eye and temporary accommodation for 125 people would be built in the garden to house staff and builders.

Royal traditions such as Changing of the Guard and the Trooping of the Colour parade to celebrate the queen's birthday would continue as usual.

Windsor Castle, another royal residence outside London, was hit by a devastating fire in 1992 in what the queen called her "annus horribilis".